Diaphragm-valve.



M. MINTZ.

DIAPHRAGM VALVE.

APPLICATION FILED FEB. 24, I9II.

` 1,203,551. I Patented 0@I.31,1916.

" UNITED sTATEs PATENT y .y

MIKE MINTz, or nocx ISLAND, ILLINOIS, asslIGNon To oEAnLnss AUTOMATIC,ruin comm, or nocx ISLAND, ILLnvoIs, A conroaa'rIoN or-ILLINoIs.

Burman-HLW.

Specification of Letters Patent.'

Patented Oct.. 31,- 1916.

Application mea February 24, Isn. serial No. 61mm.

vuseful Improvements in Diaphragm-Valves,

of which the following is a full, clear, concise, and exact description,reference being had to the accompanying drawing, forming a. art of thisspecication.

y invention relates to improvements inl diaphragm valves and has for itsobject the production of a device that may be used `in connection withany system requiring such valves, and one that is especially adapted foruse in connection with 'air compressors and vacuum pumps. p f

One of the objects of my invention is to provide a device in which theuse of packing between the diaphragm and the shell may be dispensedwith.

A further object is the production of means whereby the strain on thediaphragm when under pressure may be distributed over the entire disk.

A further object is the production of a device in 'which an improvedseat for the valve is provided thus assuring accurate adjustment of thevalve. Y

These and such other objects as may hereinafter appear are attained bymy device, an embodiment of which is illustrated in the accompanyingdrawing, in Which- Figure 1 represents a, sectional` elevationof mydevice; Fig. 2 represents a sectional view on the line 2-,2 of Fig. 1,loolnng in the direction indicated by the arrows; Fig.

' 3 represents a sectional View on vthe line 3 3 of Fig. 2, looking inthe direction indicated by the arrows. Y

Like numerals of reference indicate like parts in the several figures ofthe drawing;

Referring now to the drawing, A represents a diaphragm case comprisingan upper shell Vor covering 4 and a lower cupshaped shell 5 with adiaphragm 6, clamped between the edges of said shells. The lower shellis` provided with a circumferential flange 7 having on its upper face ashoulder or bead 8, extending entirely about the flange and the uppershell 4 lis also provided with a corresponding flange 9 preferablyturned down at its edge as shown at 10 and dapzted to fit against theend of the shouler f.

The under face of the Bange 9 is provided with a clrcumferential grooveor depression 11 registering with the bead or shoulder 8 on the lowerliange.

The diaphragm in my Apreferred construct1on 1s formed from a sheet ofcopper and having a circumferential bead 12 adapted to tit within thegroove 11 and be engaged 'by the shoulder 8, thus insurin a tight joint`without' the neceityv for pac ing.

A plurality of screws 13 pass through the flanges 7 and 9 and the outeredgev of the diaphragm 6. Ordinarily when-packing is used ,the strain onthe diaphragm would all come on the portion back of the screws, whereas,in this construction, itv is distributed equally on the entire'outercircumference of the diaphragm.

The center of the diaphragm is bored or cut away and a reinforcing plate14 inserted, providedwith a central opening 15. The under side of theplate about the opening is cut away in the shape of a spherical segmentforming a valve seat 16. An inlet opening 17 is provided in the base 18of the lower shell and a Valve stem, 19 is screwed therein. stem 19 is aspherical valve 20 adapted to lit within the seat 16. The screwconnection between the stem and the base is made loose so as to permit aslight rocking movement of, the stem and in the event that the valve isnotperfectly centered, this slight movement of the post brings the ballto the center of the opening when it seats', thus closing it tightly?The valve stem or post 19 maybe' held from backing down into the threadsby locking it in any well known manner as for.

Seated on or in the top of the From the upper shell 4 a tube 29 extends,

communicating with the interior A', to which may lie-'connected the pipe30 leading to the storage tank or reservoir (not shown). 4 n y As thcair forced through the valve is often impregnated with oil whichcollects upon the under side of the diaphragm and runs down tothe/bottom of the chamber rA2, I provide means for withdrawing thismaterial by forming a channel 31 at the lowermost portion o the chamberand communicating with a valve controlled passage 32 through which theoil is carried ofi".

The operation of my device is extremely simple air is pumped through thepipes 25 and thechamber A? through the valve opening 15 into the chamberA and through the pipe 30 into the tank or reservoir, the regulatorbeing in open communication with the chamber A through' the pipe 26.When the pressure within the tank reaches a predetermined point, theregulator automatically operates to shut off the motor operatingthepumps and at the same time opens the valve 33. y The pressure below thediaphragm at once drops and the diaphragm is forced downwardly by thepressure within the upper cham er, closing the valve opening 15. Thisvalve remains closed until the pressure within the tank falls below apredetermined point when the regulator automatically starts the motoroperating the pumps and closes the relief valve. The increase ofpressure within the lower chamber at once serves to open the valve 15and the operation is repeated.

It will be noted that the diaphragm disk 6 is tightly placed in positionagainst the valve seat, and I find it often advisable to slightly raisethe valve stem 19 to insure such setting at 4normal position. This formof assembling makes the diaphragm the equi-valent of a spring wherebythe diaphragm will be closed where the pressure is equal in thechambers, A', A2. as soon as the air is released from the chamber A to Asecond, the pressure on the upper face of the diaphragm will close itand in the event that the release valve .is not operated quickly, thespring in the diaphragm itself will close the valve. It is evident thatthis spring is practically formed by reason of the diaphragm beingtightly held between the edges of the casing by means of the bead,shoulder and groove. Attention is also called to the fact that by reasonof the spherical `valve seat 16 and the spherical stem, the accurateclosing of the valve is insured at all times whether a rocking stem isused or not; for instance, in

the ordinary cone valve seat or what is termed the needle point valve,the valve would have to come to a vperfect seat or fail Of course in itspurpose while with this construction the diaphragm disk should begreatly depressed on one side and yet by reason of the spherical shapeof the seat, the valve would close just as tightly and hold the airperfectly.

This device is extremely simple in construction in spite of which,however, it gives great durability to the diaphragm, and insures a quickand accurate seating of the valve.

rlhe relief valve, herein referred to but not claimed, switch and otherfeatures, are made the subject of separate applications, filed undereven date herewith Serial Numbers 610,642 and 610,844 and are not eX-plained in detail in the present application.

While l have illustrated an embodiment of my device, it is understood,of course, that other modifications may be made without .departing fromthe spirit of my invention.

l claim:

1. ln a device of the class described, the combination with a casingcomprising an upper shell and a lower shell, said lower shell having anaxial screw threaded opening therein, of a valve member adjustablythreaded in said opening, and having an axial opening therethroughleading from the interior of the casing and provided with a seatingportion at its upper end, of a diaphragm held between said shells andprovided with'an apertured member having a seating portion coperatingwith the first said seating portion.

2. In a device of the class described, the combination with a casingcomprising an upper shell and a lower shell, said lower shell having anaxial screw threaded opening therein, of a valve member adjustablythreaded in said opening, and having an axial opening therethroughleading from the interior of the casing and provided with a seatingportion at its upper end, of a diaphragm held between said shells landprovided with an apertured member having a seating portion coperatingwith the first said seating portion, said casing having a passagetherethrough for connection with a `pipe line, said passage being incommuni- MIKE MINTZ.

Witnesses:

BENJ. 1F. SCHRIVER, NELLE COLLINS.

Correction in Letters Patent No. 1,203,551.

It is hereby certied that in Letters Patent No. 1,203,551', grantedOctober 31',-

1916, upon the application of Mike Mintz, of Rock Island, Illinois, foran improvement in -Diaphragm-Valves`, an error appears in the printedspecification requiring correction as follows: Page 2, line l77, for theserial number 610,844 read r 610,644; and that the said Letters Patentshould be-read with this correction therein that the same may conform tothe record of the case in the Patent Ofiicle.`

Signed and sealed this 28th day of November, A. D., 1916.

- {SEAL-1 F. W. H.\CLY,

my oomwesmer of Pamu. C1. 137-32. v

